19798515 has 96 divisors (see below), whose sum is σ = 40974336. Its totient is φ = 8743680.

The previous prime is 19798511. The next prime is 19798517. The reversal of 19798515 is 51589791.

It is not a de Polignac number, because 19798515 - 2² = 19798511 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

Its product of digits (113400) is a multiple of the sum of its prime divisors (126).

It is not an unprimeable number, because it can be changed into a prime (19798511) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 421222 + ... + 421268.

It is an arithmetic number, because the mean of its divisors is an integer number (426816).

Almost surely, 2^19798515 is an apocalyptic number.

19798515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19798515 is an abundant number, since it is smaller than the sum of its proper divisors (21175821).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19798515 is a wasteful number, since it uses less digits than its factorization.

19798515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129 (or 126 counting only the distinct ones).

The product of its digits is 113400, while the sum is 45.

The square root of 19798515 is about 4449.5522246626. The cubic root of 19798515 is about 270.5271593824.

The spelling of 19798515 in words is "nineteen million, seven hundred ninety-eight thousand, five hundred fifteen".